UBUNTU-CVE-2026-59883
Guzzle PHP HTTP client versions prior to 7.12.3 contain a vulnerability in CookieJar where cookies scoped to IP addresses or bare-numeric domains are not properly restricted to the exact host that set them. This improper domain matching allows cross-host cookie disclosure, cookie injection, or session fixation. The issue is resolved in version 7.12.3.
AI Analysis
Technical Summary
The vulnerability in Guzzle's CookieJar component arises because SetCookie::matchesDomain() applies ordinary suffix matching to IP-address or numeric domain cookies (e.g., 192.168.0.1, [::1], or 1), instead of restricting cookies to the exact host that set them. This flaw enables attackers to perform cross-host cookie disclosure, injection, or session fixation attacks. The problem affects versions prior to 7.12.3 and is fixed in 7.12.3.
Potential Impact
Exploitation of this vulnerability could lead to cross-host cookie disclosure, allowing an attacker to read cookies set by other hosts, cookie injection, enabling an attacker to insert malicious cookies, or session fixation, potentially allowing unauthorized session hijacking. The CVSS vector indicates network attack vector with high attack complexity, no privileges required, user interaction required, scope changed, and low confidentiality and integrity impact with no availability impact.
Mitigation Recommendations
Upgrade Guzzle to version 7.12.3 or later where this vulnerability is fixed. No other mitigations are specified. Patch status is confirmed fixed in 7.12.3.
UBUNTU-CVE-2026-59883
Description
Guzzle PHP HTTP client versions prior to 7.12.3 contain a vulnerability in CookieJar where cookies scoped to IP addresses or bare-numeric domains are not properly restricted to the exact host that set them. This improper domain matching allows cross-host cookie disclosure, cookie injection, or session fixation. The issue is resolved in version 7.12.3.
CVSS v3.1
Score 4.7medium
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Guzzle's CookieJar component arises because SetCookie::matchesDomain() applies ordinary suffix matching to IP-address or numeric domain cookies (e.g., 192.168.0.1, [::1], or 1), instead of restricting cookies to the exact host that set them. This flaw enables attackers to perform cross-host cookie disclosure, injection, or session fixation attacks. The problem affects versions prior to 7.12.3 and is fixed in 7.12.3.
Potential Impact
Exploitation of this vulnerability could lead to cross-host cookie disclosure, allowing an attacker to read cookies set by other hosts, cookie injection, enabling an attacker to insert malicious cookies, or session fixation, potentially allowing unauthorized session hijacking. The CVSS vector indicates network attack vector with high attack complexity, no privileges required, user interaction required, scope changed, and low confidentiality and integrity impact with no availability impact.
Mitigation Recommendations
Upgrade Guzzle to version 7.12.3 or later where this vulnerability is fixed. No other mitigations are specified. Patch status is confirmed fixed in 7.12.3.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-59883
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a58b45468715ace43d6b99c
Added to database: 07/16/2026, 10:37:08 UTC
Last enriched: 07/16/2026, 11:31:29 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 5
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